One of my rats, Mira, finished her most recent course of meds (baytril and doxycycline) five days ago, with all her symptoms having subsided within four days of the course beginning. Last night, I heard her wheezing. Today, she is ungroomed and lethargic, sure signs that her URI is reoccurring. About ten minutes ago, I saw her with a long, foamy string of drool hanging from her mouth. There is clearly something very wrong with her. I am going to take her to a vet as soon as I can, but in the mean time, does anyone have any idea what's going on with her, or what I can do to help?